feat: steadier live updates and notices for public proposals

- The web pings the live connection, reconnects when it goes quiet and
  reloads what each screen shows after reconnecting.
- Dropping a card on a column it cannot go to puts it back.
- Owners and admins get a notice when a proposal arrives.
- The proposal limit lives in Redis, so it holds across instances.
- REST tells whether I voted; pasted images leave the attachment list.
- Deleting a project removes its Git integration; no lint warnings left.
- Reactions and the blocked badge are components of their own.
- Docs: what is done and what is left (chapter 10), Word and PDF.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/application/src/lib/notifications/notifications.event-handler.ts

@@ -10,10 +10,13 @@ import {
   mentionedUserIds,
   NotificationKind,
   ProjectMemberAddedEvent,
+  ProjectRole,
   StatusCategory,
+  SYSTEM_ACTOR_ID,
   TrackerEvent,
   withoutMentionMarkup,
 } from '@task-stream/api/tracker/domain';
+import { PROPOSAL_LABEL } from '../commands/submit-proposal.command-handler';
 import { FindCommentsRepository } from '../ports/find-comments.repository';
 import { FindIssuesRepository } from '../ports/find-issues.repository';
 import { FindProjectsRepository } from '../ports/find-projects.repository';
@@ -117,6 +120,25 @@ export class NotificationsEventHandler implements IEventHandler<TrackerEvent> {
     const memberIds = new Set(project.members.map((m) => m.user.id));
 
     const drafts: NotificationDraft[] = [];
+    // A proposal from the public form: whoever runs the project should know.
+    if (
+      event instanceof IssueCreatedEvent &&
+      event.actorId === SYSTEM_ACTOR_ID &&
+      event.issue.labels?.includes(PROPOSAL_LABEL)
+    ) {
+      for (const member of project.members) {
+        if (
+          member.role !== ProjectRole.OWNER &&
+          member.role !== ProjectRole.ADMIN
+        )
+          continue;
+        drafts.push({
+          userId: member.user.id,
+          kind: NotificationKind.PROPOSED,
+          summary: `Nueva propuesta en ${project.key}: ${ticket}`,
+        });
+      }
+    }
     if (event instanceof IssueCreatedEvent && assigneeId) {
       drafts.push({
         userId: assigneeId,